Updated: July 8, 2023

Periwinkle plants, also known as Vinca, are popular choices for many gardeners due to their vibrant flowers and ability to thrive in various conditions. However, like any other plant, periwinkles can be susceptible to pests and diseases. One common pest that can affect periwinkle plants is lerps. Lerps are small, sap-sucking insects that form protective coverings on the leaves of the plant, causing damage and hindering its growth. In this article, we will discuss effective methods to get rid of lerps and ensure the health and vitality of your periwinkle plant.

Identifying Lerps on Periwinkle Plants

Before we delve into the methods of eradicating lerps, it is important to be able to identify them correctly. Lerps appear as small, scale-like bumps or shells attached to the undersides of the periwinkle’s leaves. These shells are produced by lerps themselves as a means of protection from predators and harsh environmental conditions.

Lerps feed on the sap of the periwinkle plant, which weakens its overall health and makes it more vulnerable to other pests and diseases. If left untreated, a lerp infestation can cause stunted growth, yellowing leaves, and in severe cases, even death of the plant.

Natural Methods to Remove Lerps

When dealing with lerp infestations on periwinkle plants, it is best to start with natural methods before resorting to chemical pesticides. Here are some effective natural ways to get rid of lerps:

1. Pruning Infested Leaves

The first step in dealing with lerps on your periwinkle plant is to remove the infested leaves. Inspect the plant carefully and identify the leaves that have lerp coverings. Using a pair of clean pruning shears or scissors, carefully cut off the infested leaves and dispose of them properly. This will help prevent the spread of lerps to other parts of the plant.

2. Using a Strong Stream of Water

Lerps can be dislodged from the periwinkle plant by using a strong stream of water. Take a hose with a nozzle attachment and spray the affected plant thoroughly, paying extra attention to the undersides of the leaves where the lerps are usually found. The force of the water will wash away the lerps, reducing their population on the plant.

3. Introduce Beneficial Insects

Another natural method to control lerp infestations is by introducing beneficial insects to your garden. Ladybugs and lacewings are known to be natural predators of lerps. You can attract these insects to your garden by planting flowers such as daisies, marigolds, and yarrow, which act as a food source for them. Once they are present in your garden, they will help keep lerp populations in check.

4. Homemade Insecticidal Soap

Making your own insecticidal soap is an effective way to control lerps on periwinkle plants. To create this natural pesticide, mix one tablespoon of mild liquid dish soap with one quart of water in a spray bottle. Shake well to ensure it is properly mixed. Spray the solution onto the affected periwinkle plant, making sure to cover both sides of the leaves. The soap will suffocate and kill the lerps without causing harm to the plant.

Chemical Methods for Lerp Control

If natural methods fail to eliminate lerp infestations on your periwinkle plants, you may need to resort to chemical pesticides. It is important to note that chemical pesticides should be used as a last resort and with caution, as they can harm beneficial insects and pose risks to human health if not used correctly. If you decide to use chemical pesticides, follow these guidelines:

1. Choose the Right Pesticide

When selecting a pesticide, opt for one that is specifically labeled for use on lerps and safe for use on periwinkle plants. Read the label carefully and follow all instructions regarding dosage, application method, and safety precautions.

2. Apply Pesticide Correctly

Before applying the pesticide, ensure that you are wearing protective clothing such as gloves and a face mask to avoid direct contact. Mix the pesticide according to the instructions on the label and apply it to the affected periwinkle plant, targeting the lerps directly. Be sure to cover both sides of the leaves thoroughly.

3. Monitor and Repeat

After applying the pesticide, monitor the plant closely to see if the lerp population decreases. If necessary, repeat the application according to the recommended intervals mentioned on the pesticide label. Regular monitoring is essential to ensure that the infestation is completely eradicated.

Preventing Future Lerp Infestations

Prevention is always better than cure when it comes to protecting your periwinkle plants from lerp infestations. Here are some preventive measures you can take:

  • Maintain Plant Health: Keep your periwinkle plants healthy by providing them with adequate sunlight, water, and nutrients. Healthy plants are more resistant to pests and diseases.

  • Regularly Inspect Plants: Regularly inspect your periwinkle plants for any signs of lerps or other pests. Early detection can help prevent an infestation from spreading.

  • Avoid Over-Fertilizing: Excessive fertilization can make periwinkle plants more susceptible to pests and diseases. Follow recommended fertilization guidelines for your specific plant species.

  • Practice Good Garden Hygiene: Remove fallen leaves and debris from around your periwinkle plants regularly. This helps eliminate potential hiding places for lerps and other pests.

By following these methods, you can effectively get rid of lerps on your periwinkle plants and ensure their health and vitality. Remember to start with natural methods and only resort to chemical pesticides as a last option. With proper care and vigilance, your periwinkle plants will thrive and continue to beautify your garden.